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FIGURE S-1 Conceptual framework developed by the committee for MHK resource assessments. The asterisk in the third column denotes that the resource assessment groups did not attempt to evaluate the practical resource.

energy resource, typically in terawatt-hours per year (TWh/yr), and (2) a geographic information system (GIS) database that represents the spatial variation in average annual power density in units appropriate for each source—for example, W/m for waves or W/m2 for tides.

• The technical resource (center column in Figure S-1) is defined as the portion of the theoretical resource that can be captured using a specified technology. Physical and technological constraints, conceptualized as extraction filters in Figure S-1, restrict how much of the theoretical resource can actually be extracted. Based on the presentations and discussions with the resource assessment groups, the committee found that each group offered a different interpretation of what types of constraints would need to be included among its extraction filters. However, it is clear to the committee that estimating the technical resource from the theoretical resource requires filters that represent the general physical and technological constraints associated with energy-extraction devices. In the committee’s view, reporting of the technical resource represented completion of the assessment project for each group. The committee also recognizes that there are



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